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Addition
Subtraction
Addition and Subtraction
Vocabulary
Misc.
100

x+5=12

x=7

100

y−3=6

y=9

100

v+4=10

v=6

100

What is a "variable"?

A letter that represents an unknown number. 

100

 q+9=9

q=0

200

a+17=30

a=13

200

b−15=10

b=25

200

n−9=2

n=11

200

What does the word 'inverse' mean?

opposite

200

h−5=0

h=5

300

m+0=9

m=9

300

c−0=7

c=7

300

 r+11=20

r=9

300

What is the "inverse" operation of addition?

subtraction

300

w+14=21

w=7

400

p+38=45

p=7

400

d−27=8

d=35

400

s−33=7

s=40

400

What is the "inverse" operation of subtraction?

addition

400

u−46=4

u=50

500

 t+123=200

t=77

500

k−84=16

k=100

500

z+56=100

z=44

500

Explain briefly why we use inverse operations to solve one-step equations.

answers may vary accepting ones such as so we can isolate the variable, so that it equals zero on one side so that the variable is alone...

500

j+37=12

j=-25